https://bugs.llvm.org/show_bug.cgi?id=39532
Bug ID: 39532
Summary: Assembly parsing error (too many operands for
instruction) for ARM Cortex-M
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
error encountered when compiling newlib for Cortex-M3 with -Os.
====== ldrb.S ===================
.text
.global test
.type test, %function
ldrb.w r2, [r3], #1
.size test, . - strlen
==================================
Compiling above code with gives error.
$ clang -target arm-none-eabi -mcpu=cortex-m3 -c ldrb.S
ldrb.S:5:19: error: too many operands for instruction
ldrb.w r2, [r3], #1
^
GCC compiles it without complaining.
Whether or not this behavior is correct is a bit confusing because "A7.7.45
LDRB(immediate)" section of the ARM7-m architecture manual shows that .W
suffix is applied to T2 encoding but not to T3 encoding (above).
However "A7.2 Standard assembler syntax fields" suggests that .W suffix is used
to force the assembler to select 32-bit encoding. So I think Clang shouldn't
really regard it as an error.
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